Sounding apparatus



L. L. WESTLING.

SOUNDING APPARATUS. APPLICATION FILED JULY I9, 1920.

1 A27, 1 8 1L a t-ed Aug- 29, 1922.

2 SHEETS-SHEET I.

auvmto'z L. L. WESTLING.

SOUNDING APPARATUS.

APPLICATION FILED JULY 19, I920.

Patented Aug. 29, 1922.

2 SHEETS-SHEET 2.

auuentoz SDUNDING APPARATUS.

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Application filed July 19,

To all whom it may concern:

Be it known that I, LESTER L. WESTLING, a citizen of the United States, residing at Alameda, in the county of Alameda and State of California, have invented certain new and useful Improvements in Sounding Apparatus, of which the following is a specification.

This invention relates to a sounding apparatus, particularly adaptable to nautical calculations, but it may also be used in' other media, or to determine the speed of sound through a medium.

The object of my device is to provide an apparatus which is simple and rapid to operate.

Another object is to provide an apparatus which is simple and strong in construction and also compact and portable.

Other objects will appear through a perusal of the following specification:

Referring to the drawing:

Figure 1 is a top plan view of the recordingrdevice.

igure 2 is a side view of the same with the side wall removed.

Figure 3 is a plan view ofthe vibrating element.

Figure 4 is a side view of the microphone.

Figure 5 is a wiring diagram of my invention.

Referring more particularly to the drawing, the numeral 1 indicates a .recording mechanism for recording the vibrations of a body 2. The body 2 may be a tuning fork whose frequency is known. The fork 2 is securely fastened to a suitable base by 'a clamp 3. Electro-magnets 4 and 5 are positioned at the free ends of the fork 2, their purpose being to vibrate the fork as will be described. One prong of the fork 2 carries a light contact arm 6 which is adapted to contact with a screw 7. A lead 8 connects the screw 7 and the electro-magnet 4, and a lead 9 connects the two magnets 4 and 5. A second set of electro-magnets 10 are connected to the magnet 5 by lead 11. A lead 12 joins the fork 2 with the magnets 10 through a switch 13 and a battery 14. It will be seen that by this construction the electrical action of the two sets of electro-magnets is synchronized. A stylus 15 is positioned in front of the electro-magnets 10, and is adapted to be attracted by them. One end of the stylus is pivoted at 16 and the other is free to move and carries some recording material, such as Specification of Letters Patent. Patented A 29 1922 1929. Serial No. 397,460.

ink or lead. A spring 17 returns the stylus to its orlginal position against the stop 18 whenthe attractive force in the magnets 10 decreases. A paper strip 19 is adapted to be drawn under the st lus 16 b the rotation of the contacting rol s 20 an 21, between which the paper passes.

A motor 22 driven by a battery 23 and controlled by switch 24 drives the roll 21 through a pulley 25 and an idler pulley 26. A llllk 27 between the shafts of'the pulleys 25 and 26 hold them in contact, and allows the pulley 26 to rotate about the axis of the motor out of engagement with the roll 21. A spring 28 is secured to the link 27 and to the handle of a solenoid switch 29. Thus, when the switch 29 is closed the pulley 26 will contact with the roll 21 to draw the paper under the stylus 15. A lead 30 joins one pole of the switch 29 with a solenoid 31 having a core 32. A lead 33 in which is a battery 34 joins the other pole of the switch 29 and the solenoid 31. A spring 35 draws the core 32 away from the transmitting diaphragm 36 which may be the hull of a ship.

A microphone receiver 37 is placed immediately adjacent the diaphragm 36 to receive the sounds striking the diaphragm. A lead 38 in which is a balance relay 39 joins the receiver 37 and a transmitter 40. The .object of the balance relay 39 is to stop all sounds going to the transmitter except the sounds of the solenoid 31. A lead 41 in which there is a battery 42 joins the other terminals of the receiver and transmitter.

The microphone transmitter 40 has a vibrating diaphragm 43 which in its vibrations is adapted to touch a contact screw 44. lead 45 in which there is a battery 46 joins the screw 44 and a set of electro-magnets 47. A lead 48 joins the diaphragm 43 and the other terminal of the electro-magnets 47.

The electro-magnet 47 when energized is adapted to attract a stylus 49, one end of which is pivoted at 50 and the other is free to move over the paper 19, and carries some convenient recording material. A spring 51. is secured to the stylus 49 and 'returns it to its normal position against the stop 52.

The operation of my invention is as -fol-' ill to return and again make contact with the screw 7. Whereupon the operation repeats. Simultaneously the magnets 10 have attracted the stylus 15 and the spring 17 has pulled it away as the circuit was broken. It will be seen that the stylus moves synchronously with the fork 2. The switch 24 is closed and the motor is rotated which rotates the pul- ,leys 25 and 26. The switch 29 is nowclosed which brings the pulley 26 in oontact'with the roll 21, and draws the paper 19 under the stylus 15 and 49, causing the vibrating stylus 15 to leave a wavy mark on the paper. Simultaneously the solenoid 31 is energlzed by'battery 34, the core 32 strikes the diaphragm 36, which sound is received by the microphone receiver 37 and transmitted to the transmitter 40. The diaphragm 43 vibrates and contacts with screw 44 which energizes -the 'electro-magnets 47 by means of battery 46, and the stylus 49 is attracted and records a barb on the paper 19. Meanwhile, the soundof the solenoid striking the diaphragm 36 has been traveling in the medium be 0nd thediaphragm such as water, has reaclied a reflecting surface, such as the ocean floor, and is returned as an echo. This echo strikes the diaphragm 36, is received by the receiver 37 and in the same manner as above the stylus registers another barb. The paper is torn oif and the number of vibrations of the stylus 15 between the two barbs is noted. Since the number of vibrations per second of the fork 2 is known, which is identical to that of the stylus 15,

and knowing the speed of sound, per second, through the medium, it is a simple matter to compute the distance of the reflecting sur-- brating body whose period of vibration is known, means for transmitting sound through a sound medium, through which medium the speed ofsound is known, means for recording the vibrations of said vibrating body, and means for recording the sound of said sound transmitter and the echo of said sound through said medium from a reflecting surface.

2. A soundingapparatus including a vibrating body whose period of vibration is known, a stylus, a recording surface, electrical means for causing said stylus to record the vibration of said vibrating body on said recording surface, a solenoid, a sound transmitting diaphragm arranged to be struck by the core of said solenoid and to transmit the sound made thereby through a sound medium through which medium the speed of sound is known, 'a second stylus, and electrical means for recording the sound of said diaphragm made by said solenoid with said second stylus on said recording surface and the echo of said sound through iaid sound medium from a reflecting surace. I

In testimony whereof I aflix my signatureL LESTER L. WESTLIN G 4 

